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Tomcat85 Slf4j Logback Integration

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/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package org.apache.juli.logging.ch.qos.logback.core.util;

/**
 * @author Ceki Gülcü
 */
public class EnvUtil {

    private EnvUtil() {
    }

    static public int getJDKVersion(String javaVersionStr) {
        int version = 0;

        for (char ch : javaVersionStr.toCharArray()) {
            if (Character.isDigit(ch)) {
                version = (version * 10) + (ch - 48);
            } else if (version == 1) {
                version = 0;
            } else {
                break;
            }
        }
        return version;
    }

    static private boolean isJDK_N_OrHigher(int n) {
        String javaVersionStr = System.getProperty("java.version", "");
        if (javaVersionStr.isEmpty())
            return false;

        int version = getJDKVersion(javaVersionStr);
        return version > 0 && n <= version;
    }

    static public boolean isJDK5() {
        return isJDK_N_OrHigher(5);
    }

    static public boolean isJDK6OrHigher() {
        return isJDK_N_OrHigher(6);
    }

    static public boolean isJDK7OrHigher() {
        return isJDK_N_OrHigher(7);
    }

    static public boolean isJaninoAvailable() {
        ClassLoader classLoader = EnvUtil.class.getClassLoader();
        try {
            Class bindingClass = classLoader.loadClass("org.codehaus.janino.ScriptEvaluator");
            return (bindingClass != null);
        } catch (ClassNotFoundException e) {
            return false;
        }
    }

    public static boolean isWindows() {
        String os = System.getProperty("os.name");
        return os.startsWith("Windows");
    }

}